本发明还包括所述天然金刚石孕镶钻头制备方法。
The invention also relates to a method for preparing the natural diamond impregnated bit.
本发明更进一步包括制备本发明化合物的方法。
The invention further includes process by which to make the compounds of the present invention.
本发明更进一步包括制备本发明化合物的方法。
The invention further includes process by which to make the compounds of the present invention.
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